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EP0939778B1 - Perfluorelastomer zusammensetzung mit verbesserter verarbeitbarkeit - Google Patents

Perfluorelastomer zusammensetzung mit verbesserter verarbeitbarkeit Download PDF

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EP0939778B1
EP0939778B1 EP96940893A EP96940893A EP0939778B1 EP 0939778 B1 EP0939778 B1 EP 0939778B1 EP 96940893 A EP96940893 A EP 96940893A EP 96940893 A EP96940893 A EP 96940893A EP 0939778 B1 EP0939778 B1 EP 0939778B1
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perfluoroelastomer
composition
perfluoro
group
vinyl
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EP0939778A1 (de
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Walter Werner Schmiegel
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EIDP Inc
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EI Du Pont de Nemours and Co
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F214/18—Monomers containing fluorine
    • C08F214/184—Monomers containing fluorine with fluorinated vinyl ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
    • C08F2800/20—Copolymer characterised by the proportions of the comonomers expressed as weight or mass percentages

Definitions

  • This invention relates to perfluoroelastomer compositions which have excellent processability, and which, when cured, have outstanding thermal stability and chemical resistance.
  • Perfluoroelastomers are polymeric materials which exhibit outstanding high temperature tolerance and chemical resistance. Consequently, such compositions are particularly adapted for use as seals and gaskets in systems in which elevated temperatures and/or corrosive chemicals are encountered.
  • the outstanding properties of perfluoropolymers are largely attributable to the stability and inertness of the copolymerized perfluorinated monomer units which make up the major portion of the polymer backbone, e.g., tetrafluoroethylene and perfluoro(alkyl vinyl) ethers.
  • perfluoropolymers are typically crosslinked, i.e. vulcanized.
  • cure site monomer containing at least one nitrile group, for example perfluoro-8-cyano-5-methyl-3,6-dioxa-1-octene, are especially preferred.
  • Cure site monomers containing at least one nitrile group, for example perfluoro-8-cyano-5-methyl-3,6-dioxa-1-octene, are especially preferred.
  • Such compositions are described in U.S. Patents 4,281,092 and 4,394,489; and in International Application WO 95/22575.
  • a recently-developed class of perfluoroelastomers having carbonyl-containing functional groups is disclosed in co-pending U.S. Patent Application Serial Number Unknown, filed as case designation AD-6425 and entitled "Fast-curing Perfluoroelastomer Compositions," filed November 25, 1996.
  • These polymers are characterized by having carbonyl-containing functional groups, including carboxyl groups, carboxylate groups, carboxamide groups, and mixtures thereof.
  • the carbonyl-containing functional groups are generated as a result of persulfate initiation of the polymerization reaction and the reaction is carried out in the absence of sulfite or bisulfite reducing agents.
  • the carbonyl-containing perfluoroelastomers exhibit outstanding cure characteristics but they are difficult to process in certain end-uses because of their relatively high viscosity.
  • a method for decreasing viscosity of the carbonyl-containing perfluoroelastomers would permit use of these materials in a wider variety of end-use applications.
  • the invention is directed to curable compositions comprising
  • the invention is further directed to a curable perfluoroelastomer composition
  • a curable perfluoroelastomer composition comprising
  • compositions are further characterized in that substantially no type of ionized or ionizable endgroup other than carbonyl-containing ionized or ionizable endgroups is present.
  • substantially no other type of ionized or ionizable endgroup it is meant that no more than 0.75 millimoles per kilogram of polymer of these other ionizable or ionized endgroups are present.
  • Such other ionized or ionizable endgroups include sulfonic acid and sulfonate endgroups. If these non-carboxyl or non-carboxylate groups are present in significant quantity, then the viscosity of the polymer begins to increase, which makes polymer processing difficult.
  • This class of perfluoroelastomer compositions are prepared by partial decarboxylation of perfluoroelastomers having ionized or ionizable carbonyl-containing functional groups.
  • the curable compositions of the present invention comprise curable perfluoroelastomer compositions comprising a perfluoroelastomer component having substantial levels of carbonyl-containing functional groups in combination with a curative component wherein the curative is other than an organotin compound.
  • curable perfluoroelastomer compositions comprising a perfluoroelastomer component having substantial levels of carbonyl-containing functional groups in combination with a curative component wherein the curative is other than an organotin compound.
  • Perfluoroelastomers are polymeric compositions having copolymerized units of at least two principal perfluorinated monomers. Generally, one of the principal comonomers is a perfluoroolefin while the other is a perfluorovinyl ether. Representative perfluorinated olefins include tetrafluoroethylene and hexafluoropropylene.
  • Most preferred perfluoro(alkyl vinyl) ethers are those wherein n is 0 or 1 and R f contains 1-3 carbon atoms. Examples of such perfluorinated ethers include perfluoro(methyl vinyl) ether and perfluoro(propyl vinyl) ether.
  • CF 2 CFO[(CF 2 ) m CF 2 CFZO] n R f
  • R f is a perfluoroalkyl group having 1-6 carbon atoms
  • m 0 or 1
  • Preferred copolymers are composed of tetrafluoroethylene and at least one perfluoro(alkyl vinyl) ether as principal monomer units.
  • the copolymerized perfluorinated ether units constitute from about 15-50 mole percent of total monomer units in the polymer.
  • the perfluoropolymer further contains copolymerized units of at least one cure site monomer, generally in amounts of from 0.1-5 mole percent. The range is preferably between 0.3-1.5 mole percent. Although more than one type of cure site monomer may be present, most commonly one cure site monomer is used and it contains at least one nitrile substituent group. Suitable cure site monomers include nitrile-containing fluorinated olefins and nitrile-containing fluorinated vinyl ethers. Useful cyano-substituted cure site monomers include those of the formulas shown below.
  • Especially preferred cure site monomers are perfluorinated polyethers having a nitrile group and a trifluorovinyl ether group.
  • the perfluoroalkyl group may contain up to about 12 carbon atoms. However, perfluoroalkyl groups of up to 4 carbon atoms are preferred.
  • the curesite monomer preferably has no more than three hydrogen atoms. Examples of such olefins include ethylene, vinylidene fluoride, vinyl fluoride, trifluoroethylene, 1-hydropentafluoropropene, and 2-hydropentafluoropropene.
  • An especially preferred perfluoroelastomer contains 53.0-79.9 mole percent tetrafluoroethylene, 20.0-46.9 mole percent perfluoro(methyl vinyl) ether and 0.4 to 1.5 mole percent nitrile-containing cure site monomer.
  • carbonyl-containing functional groups present in the perfluoroelastomers of this invention are either present as polymer endgroups or as pendant functionalities introduced as a result of copolymerization of fluorinated carbonyl-containing comonomers.
  • carbonyl-containing comonomer is meant a fluorinated monomer having a copolymerizable double bond and at least one pendant carboxylic acid group (including salts thereof), pendant carboxylic acid ester group, or pendant carboxamide group.
  • Perfluoroelastomers having carboxyl or carboxylate endgroups can be prepared by polymerization of mixtures of perfluoroolefins and perfluorovinyl ethers in the presence of a free radical generating initiator either in bulk, in solution in an inert solvent, in aqueous suspension, or in aqueous emulsion.
  • Perfluoroelastomer polymerization techniques are described in general in Logothetis, Prog. Polymn. Sci , Vol. 14, 252-296 (1989) and in co-pending U.S. Patent Application Serial Number Unknown, filed as case designation AD-6425 and entitled "Fast-curing Perfluoroelastomer Composition,” filed November 25, 1996.
  • the logothetis article discloses, among others, a method of polymerization which involves initiation by persulfates, such as ammonium or potassium persulfate, in the absence of a reducing agent.
  • Thermally initiated free-radical polymerization using persulfates in the absence of a reducing agent results in the production of polymers having carboxylic acid end groups which ionize to form carboxylate groups.
  • Reducing agents include such compounds as sodium sulfite and sodium hydrogen sulfite.
  • carboxylated polymers having superior cure characteristics may be obtained by copolymerizing perfluoroolefins and perfluorovinyl ethers by initiating the copolymerization reaction with ammonium persulfate, in the absence of a reducing agent, in aqueous emulsion in a continuous well-stirred reactor with a residence time of 2-4 hours, at a temperature of 75°C-90°C and at a pressure of 2-8 MPa.
  • the residence time is between 3.0-3.7 hours, the temperature is 80°C-85°C, and the pressure is 6.0-8.0 MPa. If levels of reducing agent above 5 mole percent, based on ammonium persulfate, are present, then the amount of sulfonate endgroups reaches a level which has detrimental effects on processability.
  • the pH of the polymerization reaction mixture is generally between 3.5-7.0, preferably between 4.5-6.5. Tetrafluoroethylene and perfluoro(methyl vinyl) ether monomers are preferred and are fed by compressor. If a cure site monomer is used, it is preferably fed by liquid metering pump or by a compressor.
  • This polymerization method results in production of a perfluoroelastomer copolymer composition having a significant proportion of carboxyl-containing endgroups, carboxylate-containing endgroups, carboxamide endgroups, or mixtures thereof.
  • the number of carboxyl, carboxylate, and carboxamide groups present in the nitrile-containing perfluoroelastomers accounts for the carbonyl content and is related to the ratio of radicals generated to polymerization rate. Specifically, the ratio of the radical generation rate, calculated from persulfate thermal decomposition kinetics, to the polymerization rate provides a measure of the carbonyl content of the polymer. Thermal decomposition rates for persulfate are correlated in F. A.
  • the polymerization rate R p (kg/hour) is readily measured, so that the ratio R i /R p can be calculated for correlation with the observed carboxylate levels.
  • the ratio R i /R p should be in the range of about 10-50 mmol/kg, preferably 20-40 mmol/kg.
  • Carbonyl-containing functional groups may also be introduced by copolymerization of fluorinated carboxyl-containing comonomers with the principal perfluoroolefins and perfluorovinyl ether comonomers. Cure site monomers may also be copolymerized into the polymer as well. Such copolymerizations may be conducted substantially as described above. If the sole initiator is a persulfate salt, then carbonyl-containing endgroups will also result. If a sulfite or bisulfite reducing agent is additionally present, then the resultant copolymers will contain sulfonic acid or sulfonate endgroups and carboxyl or carboxylate groups.
  • the polymer emulsion upon exiting the reactor, is coagulated with an aqueous solution of a multivalent metal salt, such as magnesium sulfate.
  • a multivalent metal salt such as magnesium sulfate.
  • the coagulated polymer is then washed with deionized water and dried at 70°-100°C in a circulating air oven.
  • the carbonyl content of the perfluoroelastomers employed in the invention may be determined by an integrated absorbance ratio method based on Fourier transform infrared analysis. Specifically, the total content of carboxyl, carboxylate, and carboxamide groups in the polymer is determined by measuring the integrated carbonyl absorbance (i.e. the total area of all peaks in the region 1620-1840 cm -1 ) of thin polymer films using a Fourier transform IR spectrometer. In order to compare the carbonyl level in different polymer samples, integrated absorbance was normalized for differences in polymer film thickness by taking the ratio of the carbonyl integrated absorbance to the thickness band integrated absorbance.
  • integrated carbonyl absorbance i.e. the total area of all peaks in the region 1620-1840 cm -1
  • Thickness band integrated absorbance was the total area of all peaks in the region 2200-2740 cm -1 .
  • the integrated absorbance of peaks in the latter region is proportional to the thickness of the polymer film.
  • the integrated absorbance ratio can be readily used to calculate the concentration of carbonyl groups in the polymer by comparing the integrated absorbance ratio of the polymer to that of a standard polymer of known carboxyl or carboxylate content.
  • Such standards may be prepared from polymers which have been heated in order to completely decarboxylate them, as described in co-pending U.S. Patent Application Serial Number 08/755,919, filed as case designation AD-6425 and entitled "Fast-curing Perfluoroelastomer Composition," filed November 25, 1996 equivalent to EP-A-863941.
  • a carbonyl-containing compound such as ammonium perfluorooctanoate may then be added to the substantially completely decarboxylated polymer in order to produce a calibration curve of integrated absorbance ratio versus concentration of ammonium perfluorooctanoate.
  • a preferred cure system useful for perfluoroelastomers containing nitrile-containing curesites utilizes bis(aminophenols) arid bis(aminothiophenols) of the formulas and and tetraamines of the formula where A is SO 2 , O, CO, alkyl of 1-6 carbon atoms, perfluoroalkyl of 1-10 carbon atoms, or a carbon-carbon bond linking the two aromatic rings.
  • the amino and hydroxyl groups in formulas I and II above, are interchangeably in the meta and para positions with respect to the group A.
  • the curing agent is a compound selected from the group consisting of 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)-ethylidene]bis(2-aminophenol); 4,4'-sulfonylbis(2-aminophenol); 3,3'-diaminobenzidine; and 3,3',4,4'-tetraaminobenzophenone.
  • the first of these is the most preferred and will be referred to as bis(aminophenol) AF.
  • the curing agents can be prepared as disclosed in U.S. Patent Number 3,332,907 to Angelo.
  • Bis(aminophenol) AF can be prepared by nitration of 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene]bisphenol (i.e. bisphenol AF), preferably with potassium nitrate and trifluoroacetic acid, followed by catalytic hydrogenation, preferably with ethanol as a solvent and a catalytic amount of palladium on carbon as catalyst.
  • the level of curing agent should be chosen to optimize the desired properties of the vulcanizate. In general, a slight excess of curing agent over the amount required to react with all the cure sites present in the polymer is used. Typically, 0.5-5.0 parts by weight of the curative per 100 parts of polymer is required. The preferred range is 1.0-2.0 parts.
  • Peroxides may also be utilized as curing agents.
  • Useful peroxides are those which generate free radicals at curing temperatures.
  • a dialkyl peroxide or a bis(dialkyl peroxide) which decomposes at a temperature above 50°C is especially preferred.
  • the most useful peroxides of this type are 2,5-dimethyl-2,5-di(tertiarybutylperoxy)hexyne-3 and 2,5-dimethyl-2,5-di(tertiarybutylperoxy)hexane.
  • peroxides can be selected from such compounds as dicumyl peroxide, dibenzoyl peroxide, tertiarybutyl perbenzoate, and di[1,3-dimethyl-3-(t-butylperoxy)-butyl]carbonate. Generally, about 1-3 parts of peroxide per 100 parts of perfluoroelastomer is used.
  • Another material which is usually blended with the composition as a part of the peroxide curative system is a coagent composed of a polyunsaturated compound which is capable of cooperating with the peroxide to provide a useful cure.
  • coagents can be added in an amount equal to 0.1 and 10 parts per hundred parts perfluoroelastomer, preferably between 2-5 parts per hundred parts perfluoroelastomer.
  • the coagent may be one or more of the following compounds: triallyl cyanurate; triallyl isocyanurate; tri(methylallyl) isocyanurate; tris(diallylamine)-s-triazine; triallyl phosphite; N,N-diallyl acrylamide; hexaallyl phosphoramide; N,N,N',N'-tetraalkyl tetraphthalamide; N,N,N',N'-tetraallyl malonamide; trivinyl isocyanurate; 2,4,6-trivinyl methyltrisiloxane; and tri(5-norbornene-2-methylene)cyanurate. Particularly useful is triallyl isocyanurate.
  • perfluoroelastomers having copolymerized units of nitrile-containing cure site monomers can be cured using a curative comprising a mixture of a peroxide in combination with an organotin curative and a coagent.
  • a curative comprising a mixture of a peroxide in combination with an organotin curative and a coagent.
  • 0.3-5 parts of peroxide, 03-5 parts of coagent, and 0.1-10 parts of organotin curative are utilized.
  • Additives such as carbon black, stabilizers, plasticizers, lubricants, fillers, and processing aids typically utilized in perfluoroelastomer compounding can be incorporated into the compositions of the present invention, provided they have adequate stability for the intended service conditions. In particular, low temperature performance can be enhanced by incorporation of perfluoropolyethers.
  • Carbon black fillers are used in elastomers as a means to balance modulus, tensile strength, elongation, hardness, abrasion resistance, conductivity, and processability of the compositions.
  • small particle size, high surface area carbon blacks have been the fillers of choice.
  • a grade commonly chosen is SAF carbon black, a highly reinforcing black with typical average particle size of about 14 nm and designated N 110 in Group No. 1, according to ASTM D-1765.
  • the particular carbon blacks useful in the compositions of the present invention are those described in WO 95/22575. These particular carbon blacks have average particle sizes of at least about 100 nm to about 500 nm as determined by ASTM D-3849.
  • Examples include MT blacks (medium thermal black) designated N-991, N-990, N-908, and N-907, and large particle size furnace blacks. MT blacks are preferred. When used, 1-70 phr of large size particle black is generally sufficient, and this amount does not retard cure time.
  • fluoropolymer fillers may also be present in the composition. Generally from 1 to 50 parts per hundred perfluoroelastomer of a fluoropolymer filler is used, and preferably at least about 5 parts per hundred parts perfluoroelastomer is present.
  • the fluoropolymer filler can be any finely divided, easily dispersed plastic fluoropolymer that is solid at the highest temperature utilized in fabrication and curing of the perfluoroelastomer composition. By solid, it is meant that the fluoroplastic, if partially crystalline, will have a crystalline melting temperature above the processing temperature(s) of the perfluoroelastomer(s). Such finely divided, easily dispersed fluoroplastics are commonly called micropowders or fluoroadditives. Micropowders are ordinarily partially crystalline polymers.
  • Micropowders that can be used in the composition of the invention include, but are not limited to, those based on the group of polymers known as tetrafluoroethylene (TFE) polymers.
  • TFE tetrafluoroethylene
  • This group includes homopolymers of TFE (PTFE) and copolymers of TFE with such small concentrations of at least one copolymerizable modifying monomer that the resins remain non-melt-fabricable (modified PTFE).
  • the modifying monomer can be, for example, hexafluoropropylene (HFP), perfluoro(propyl vinyl) ether (PPVE), perfluorobutyl ethylene, chlorotrifluoroethylene, or another monomer that introduces side groups into the polymer molecule.
  • the concentration of such copolymerized modifiers in the polymer is usually less than 1 mole percent.
  • the PTFE and modified PTFE resins that can be used in this invention include both those derived from suspension
  • High molecular weight PTFE used in production of micropowder is usually subjected to ionizing radiation to reduce molecular weight. This facilitates grinding and enhances friability if the FIFE is produced by the suspension polymerization process, or suppresses fibrillation and enhances deagglomeration if the PTFE is produced by the emulsion polymerization process. It is also possible to polymerize TFE directly to PTFE micropowder by appropriate control of molecular weight in the emulsion polymerization process, such as disclosed by Kuhls et al . in U.S. Patent 3,956,000. Morgan, in U.S.
  • Patent 4,879,362 discloses a non-melt-fabricable, non-fibrillating modified PTFE produced by the emulsion (dispersion) polymerization process. This polymer forms platelets on shear blending into elastomeric compositions, instead of fibrillating.
  • TFE polymers also include melt-fabricable copolymers of TFE having sufficient concentrations of copolymerized units of one or more monomers to reduce the melting point significantly below that of PTFE.
  • Such copolymers generally have melt viscosity in the range of 0.5-60 x 10 3 Pa.s, but viscosities outside this range are known.
  • Perfluoroolefins and perfluoro(alkyl vinyl) ethers are preferred comonomers. Hexafluoropropylene and perfluoro(propyl vinyl) ether are most preferred.
  • TFE copolymers such as FEP (TFE/hexafluoropropylene copolymer) and PFA [TFE/perfluoro(propyl vinyl)ether copolymer] can be used, provided they satisfy constraints on melting temperature with respect to perfluoroelastomer processing temperature.
  • FEP TFE/hexafluoropropylene copolymer
  • PFA TFE/perfluoro(propyl vinyl)ether copolymer
  • These copolymers can be utilized in powder form as isolated from the polymerization medium, if particle size is acceptable, or they can be ground to suitable particle size starting with stock of larger dimensions.
  • the curable compositions of the present invention are useful in production of gaskets, tubing, and seals. Such articles are produced by molding a compounded formulation of the curable composition with various additives under pressure, curing the part, and then subjecting it to a post cure cycle.
  • the cured compositions have excellent thermal stability and chemical resistance. They are particularly useful in applications such as seals and gaskets for manufacturing semiconductor devices, and in seals for high temperature automotive uses.
  • Compression set of O-ring samples was determined in accordance with ASTM D 395.
  • the perfluoroelastomer terpolymer was prepared by aqueous emulsion polymerization at 85°C and approximately 600 psi (4.1 MPa) in a continuous reactor with agitation.
  • the surfactant for the polymerization was ammonium perfluorooctanoate and the sole initiator was ammonium persulfate.
  • TFE and PMVE monomers were fed from compressors and liquid cure site monomer, 8-CNVE, was fed neat from a high pressure metering pump.
  • a buffering salt, disodium hydrogen phosphate was present to control the pH in the range 4.5-6.5 to counteract acidity generated by persulfate decomposition.
  • Polymer Crumb A had Mooney Viscosity (ML-10 @ 121°C) of 116.
  • Polymer Crumb A was heat treated in a circulating air oven at 300°C for 60 minutes in order to produce a substantially decarboxylated polymer.
  • This polymer had Mooney Viscosity (ML-10 @ 121°C) of 69, which represents a substantial decrease compared to the Mooney viscosity of Polymer Crumb A.
  • Mooney Viscosity ML-10 @ 121°C
  • the heat treated polymer of this invention is easier to process than the non-heat treated Polymer Crumb A.

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Claims (13)

  1. Härtbare Perfluorelastomerzusammensetzung, umfassend
    (A) ein Perfluorelastomer, umfassend copolymerisierte Einheiten von (1) einem Perfluorolefin; (2) einem Perfluorvinylether, ausgewählt aus der Gruppe, bestehend aus Perfluor(alkylvinyl)ethern, Perfluor(alkoxyvinyl)ethern und Gemischen davon; und (3) einem Monomer mit Härtungsstelle mit mindestens einer Nitrilgruppe, ausgewählt aus der Gruppe, bestehend aus fluorierten Olefinen mit mindestens einer Nitrilgruppe, fluorierten Vinylethern mit mindestens einer Nitrilgruppe und Gemischen davon; wobei das Perfluorelastomer dadurch gekennzeichnet ist, daß es i) aufweist eine Mehrzahl von carbonylhaltigen Endgruppen, ausgewählt aus der Gruppe, bestehend aus Carboxylendgruppen, Carboxylatendgruppen, Carboxamidendgruppen und Gemischen davon, und ii) aufweist nicht mehr als 0,75 Millimol pro kg Polymer von ionisierbaren oder ionisierten Endgruppen, die andere sind als diejenigen mit carbonylhaltigen funktionellen Gruppen; und wobei das integrierte Extinktionsverhältnis der carbonylhaltigen Endgruppen größer als 0,1 ist, wobei das integrierte Extinktionsverhältnis durch Berechnen des Verhältnisses der integrierten Peakintensität innerhalb des Bereiches von 1620-1840 cm-1 zu dem innerhalb des Bereiches von 2220-2740 cm-1, wie gemessen auf einem Fourier-Transform-Infrarotspektrum des Perfluorelastomers, bestimmt wird; und
    (B) 0,1 bis 10 Gewichtsteile pro hundert Gewichtsteile Perfluorelastomer von einem Härtungsmittel, das ein anderes ist als ein Organzinn-Härtungsmittel.
  2. Zusammensetzung nach Anspruch 1, wobei das Perfluorelastomer copolymerisierte Einheiten von Tetrafluorethylen, Perfluor(methylvinyl)ether und Perfluor(8-cyano-5-methyl-3,6-dioxa-1-octen) umfaßt.
  3. Härtbare Perfluorelastomerzusammensetzung, umfassend
    (A) ein Perfluorelastomer mit einer Mehrzahl von carbonylhaltigen funktionellen Gruppen, ausgewählt aus der Gruppe, bestehend aus Carboxylgruppen, Carboxylatgruppen und Carboxamidgruppen, wobei das Perfluorelastomer copolymerisierte Einheiten umfaßt von (1) einem Perfluorolefin; (2) einem Perfluorvinylether, ausgewählt aus der Gruppe, bestehend aus Perfluor(alkylvinyl)ethem, Perfluor(alkoxyvinyl)ethem und Gemischen davon; (3) einem fluorierten Comonomer, ausgewählt aus der Gruppe, bestehend aus carboxylhaltigen und carboxylathaltigen Comonomeren, und (4) einem Monomer mit Härtungsstelle mit mindestens einer Nitrilgruppe, ausgewählt aus der Gruppe, bestehend aus fluorierten Olefinen mit Nitrilgruppen, fluorierten Vinylethern mit mindestens einer Nitrilgruppe und Gemischen davon, wobei das integrierte Extinktionsverhältnis der carbonylhaltigen funktionellen Gruppen größer als 0,1 ist, wobei das Extinktionsverhältnis durch Berechnen des Verhältnisses der integrierten Peakintensität innerhalb des Bereiches von 1620-1840 cm-1 zu dem innerhalb des Bereiches von 2220-2740 cm-1, wie gemessen auf einem Fourier-Transform-Infrarotspektrum des Perfluorelastomers, bestimmt wird; und
    (B) 0,1 bis 10 Gewichtsteile pro hundert Gewichtsteile Perfluorelastomer von einem Härtungsmittel, das ein anderes ist als ein Organzinn-Härtungsmittel.
  4. Zusammensetzung nach Anspruch 1 oder 3, wobei das Härtungsmittel ausgewählt ist aus der Gruppe, bestehend aus Zusammensetzungen der Formeln
    Figure 00280001
    Figure 00280002
    und
    Figure 00280003
    wo A SO2, O, CO, Alkyl mit 1-6 Kohlenstoffatomen, Perfluoralkyl mit 1-10 Kohlenstoffatomen oder eine Kohlenstoff-Kohlenstoff-Bindung, die die zwei aromatischen Ringe verknüpft, ist.
  5. Zusammensetzung nach den Ansprüchen 1 oder 3, wobei das Härtungsmittel ein Dialkylperoxid ist.
  6. Zusammensetzung nach Anspruch 1 oder 3, wobei das Härtungsmittel 4,4'-[2,2,2-Trifluor-1-(trifluormethyl)-ethyliden]bis(2-aminophenol) ist.
  7. Zusammensetzung nach Anspruch 1 oder 3, wobei das Härtungsmittel 4,4'-Sulfonylbis(2-aminophenol) ist.
  8. Zusammensetzung nach Anspruch 1 oder 3, wobei das Härtungsmittel 3,3'-Diaminobenzidin ist.
  9. Zusammensetzung nach Anspruch 1 oder 3, wobei das Härtungsmittel 3,3',4,4'-Tetraaminobenzophenon ist.
  10. Zusammensetzung nach Anspruch 1 oder 3, wobei der Perfluorvinylether ein Perfluor(alkylvinyl)ether ist.
  11. Zusammensetzung nach Anspruch 10, wobei der Perfluor(alkylvinyl)ether Perfluor(methylvinyl)ether ist.
  12. Zusammensetzung nach Anspruch 1 oder 3, wobei das Monomer mit Härtungsstelle ein nitrilhaltiger fluorierter Vinylether ist.
  13. Zusammensetzung nach Anspruch 12, wobei der nitrilhaltige fluorierte Vinylether Perfluor(8-cyano-5-methyl-3,6-dioxa-1-octen) ist.
EP96940893A 1996-11-25 1996-11-26 Perfluorelastomer zusammensetzung mit verbesserter verarbeitbarkeit Expired - Lifetime EP0939778B1 (de)

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US75594696A 1996-11-25 1996-11-25
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PCT/US1996/018963 WO1998023655A1 (en) 1996-11-25 1996-11-26 Perfluoroelastomer composition having improved processability

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DE69628465D1 (de) 2003-07-03
US5789509A (en) 1998-08-04
JP3676823B2 (ja) 2005-07-27
JP2002500685A (ja) 2002-01-08
EP0939778A1 (de) 1999-09-08
JP2005048193A (ja) 2005-02-24
WO1998023655A1 (en) 1998-06-04

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